rust/kernel/time.rs

1 // SPDX-License-Identifier: GPL-2.0
14 pub const NSEC_PER_MSEC: i64 = bindings::NSEC_PER_MSEC as i64;
24 pub fn msecs_to_jiffies(msecs: Msecs) -> Jiffies {  in msecs_to_jiffies()
27     unsafe { bindings::__msecs_to_jiffies(msecs) }  in msecs_to_jiffies()
34     inner: bindings::ktime_t,
40     pub fn from_raw(inner: bindings::ktime_t) -> Self {  in from_raw()
46     pub fn ktime_get() -> Self {  in ktime_get()
48         Self::from_raw(unsafe { bindings::ktime_get() })  in ktime_get()
51     /// Divide the number of nanoseconds by a compile-time constant.
53     fn divns_constant<const DIV: i64>(self) -> i64 {  in divns_constant()
59     pub fn to_ns(self) -> i64 {  in to_ns()
65     pub fn to_ms(self) -> i64 {  in to_ms()
72 pub fn ktime_ms_delta(later: Ktime, earlier: Ktime) -> i64 {  in ktime_ms_delta()
73     (later - earlier).to_ms()  in ktime_ms_delta()
80     fn sub(self, other: Ktime) -> Ktime {  in sub()
82             inner: self.inner - other.inner,  in sub()
87 /// An identifier for a clock. Used when specifying clock sources.
90 /// Selection of the clock depends on the use case. In some cases the usage of a
91 /// particular clock is mandatory, e.g. in network protocols, filesystems.In other
92 /// cases the user of the clock has to decide which clock is best suited for the
93 /// purpose. In most scenarios clock [`ClockId::Monotonic`] is the best choice as it
98     /// A settable system-wide clock that measures real (i.e., wall-clock) time.
100     /// Setting this clock requires appropriate privileges. This clock is
102     /// administrator manually changes the clock), and by frequency adjustments
104     /// clock_adjtime(2), and ntp_adjtime(3). This clock normally counts the
105     /// number of seconds since 1970-01-01 00:00:00 Coordinated Universal Time
108     /// second smearing applies frequency adjustments to the clock to speed up
109     /// or slow down the clock to account for the leap second without
110     /// discontinuities in the clock. If leap second smearing is not applied,
111     /// the clock will experience discontinuity around leap second adjustment.
112     RealTime = bindings::CLOCK_REALTIME,
113     /// A monotonically increasing clock.
115     /// A nonsettable system-wide clock that represents monotonic time since—as
120     /// The CLOCK_MONOTONIC clock is not affected by discontinuous jumps in the
122     /// clock), but is affected by frequency adjustments. This clock does not
124     Monotonic = bindings::CLOCK_MONOTONIC,
127     /// A nonsettable system-wide clock that is identical to CLOCK_MONOTONIC,
129     /// allows applications to get a suspend-aware monotonic clock without
132     BootTime = bindings::CLOCK_BOOTTIME,
135     /// A system-wide clock derived from wall-clock time but counting leap seconds.
137     /// This clock is coupled to CLOCK_REALTIME and will be set when CLOCK_REALTIME is
141     /// smearing, this clock will not be precise during leap second smearing.
144     TAI = bindings::CLOCK_TAI,
148     fn into_c(self) -> bindings::clockid_t {  in into_c()
149         self as bindings::clockid_t  in into_c()